Improvement in governors for direct-acting engines



lay-2.

ILPETERvS, PMOTO-LTHDGRAPHER. WASHINGTON, D. C,

this invention.

Parma-rr ottica.

\ ADAM S. CAMERON, OF'NEW YORK, N. Y.

IMPROVEMENT IN GOVERNRS FOR DIRECT-ACTING ENGINES.

Speccation forming part of Letters Patent N0. 112,416, dated March 7, 1871.

` To all whom it may concern.-

Beit known that I, Annu S. CAMERON, oi the city, county, and State of New York, have invented a new and Improved Governor for Direct-Acting Engines; and I do hereby declare the following to be a full, clear, and exact description thereof, which will enable those skilled in the art to make and use the same,

I, reference` beinghad to the accompanying drawing, forming part ofthis speciication in which drawing- Figure 1 represents a sectional side view of Fig."2 `is asimilar view of a modification thereof when the mechanism is arranged for stopping the supply ot' steam whenever thesteam-piston approaches closely one of the cylinder-heads.

, Similar letters indicate corresponding parts. `This invention `relates to a mechanism by which the supply of steam to the steam-cylinder of a direct-actin g engine is either partially or wholly cut 'off by the action ofthe .piston on a tappet extending into the cylinder whenever the speed of thepiston exceeds a certain limit, and consequentlyyin the absence ofa crank, said piston is carried by its momentum closer to the cylinder-head than desirable, and thereby the piston is effectuallyprevented from slamming against the cylinder-head, and all danger ot having the cylinder-heads knocked out, if the engine is suddenly relieved of its load, is avoided. This `object is effected by a lever which is secured to the spindle of the throttle-valve, and the position of which is controlled by that of a tappet or tappets extending through eitherone or bothcylinder-heads,

i or through the sides of the cylinder, in such a manner that, wheneverthe'piston strikes the tappet, the throttle-valve is either partially or wholly closed. i

, In the drawing, the letter A designates the steam-cylinder ot' a direct-acting en gine, which is `iitted with a piston, B, and to which steam V is admitted through the pipe C in the ordinary manner.

rlhe supply of steam to the cylinder is regulated by means ot' the throttle-valve D, and on the spindle of this `throttle-valve I have mounted a lever, E, whichA may either be in a vertical position, as shown in Fig. 1, or in a horizontal position, as shown inA Fig. 2. The end of the lever E, Fig. 1, extends through a slot, d, in a yoke, a, in the ends or' which are secured two tappets, b, extending Jthrough the cylinder-heads, as shown. L

Whenever the speed of the pistonexceeds a certain limit, so that the same by its momentum will loe carried closer up to either ot the cylinder-heads than desirable, the tappet in said head will be forced out, the yoke caused to turn the lever E, and the throttle-valve is partially or wholly closed. In this case the tappets are made to extend through the cylinder-heads to such a distance that the piston will just touch them when it travels at its mean speed; but as soon as the speed of the piston increases the tappets will be actuated, and the throttle-valve is partially closed at the end of each stroke, and remains thus While the engine is taking steam during the succeeding stroke.

It is obvious that the form or construction of the throttle-valve used in the above-described mechanism may be changed in various ways. For instance, a simple slide might be used, provided with a hole to open and close the supply of steam to the cylinder, This slide might be provided with hooks at its ends to connect with the tappets. In some cases it may be sufficient to use only one tappet, bit, extending through one ot' the Vcylinder-heads, and a lever, Et, placed in a horizontal position, as shown in Fig. 2. This lever is loaded by a weight, c, and the stop a* is hinged at .the bottom end, and placed in such a position that its top end may be brought un'- der the outer end of the lever Et.

In the stop a* is secured the tappet bia If I the piston strikes the inner end ot' the tappet, the stop is forced out and the lever E* drops down so as to close the throttle-valve and to shut 0E the steam. The tappet b* is made adjustable in the stop ci, so that it can loe made to extend to a greater or lesser distance into the cylinder, and thereby the stop mechanism can be accommodated to the desired maximum speed of the piston.

To keep the stop a* in the proper position, a guide-pin, c, is provided, which also prevents said stop from swinging out any farther than required to release the lever Et, and a spring,

f, presses against the stop to counteract the pressure of the steam on the inner end of the tappet, which has a tendency to force the stop a* ont.

This stop mechanism effectually Aprevents the piston from doing any injury in case the engine is suddenly released of its load.

What l claiin as new, and desire to secure by Letters Patent, is-

The mechanism, substantially as herein described, for regulating or stopping the supply 

